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...Psychology public policy and law copyright by the american psychological association vol no doi thirty years of research on race differences in cognitive ability j philippe rushton arthur r jensen university western ontario california berkeley culture only genetic environmental hereditarian modelsofthecausesofmeanblack whitedifferences are compared contrasted across categories evidence worldwidedistribution test scores g factor mental heritability brain size transracial adoption racial admixture regression related life history traits human origins hypothesized vari ables new reviewed here points to some component black white mean iq implication for is that discrimination model i e socially valued outcomes will be equal barring must tempered a distributional reect underlying group characteristics section background throughout question has been so persistent or resistant resolution as relative roles nature nurture causing individual degler loehlin lindzey spuhler scientic debate goes bac...